Box wrench



FIG. 1 is a front, top and side perspective view of the box wrench showing my new design;

FIG. 2 is a front end elevational view thereof;

FIG. 3 is a rear end elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a side elevational view thereof; and,

FIG. 6 is a top plan view thereof, the bottom view being a mirror image of the top view shown in FIG. 6. 

The ornamental design for a box wrench, as shown and described. 